[bisq-network/bisq] Fix Bank transfer 'Copy BSB number' bug (#5200)

[Conza]

### Steps to reproduce
- Take offer
- National Bank Transfer method
- Go to pay trader, open trade ID details
- Hit copy the BSB number
- *Instead it copies the NAME of the bank, not the number

Most certainly first world problems I know, but is a small fix hopefully.

May be present on OTHER bank payment methods as well. 

![image](https://user-images.githubusercontent.com/51952482/108187175-49927200-7162-11eb-8a71-7a5ddcf639d1.png)

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